"Tom Seaver is an excellent example. Seaver had a high rising fast ball that started out a little above the batter's belt and kept rising. Most batters could not catch up to it but had to offer at such pitches. If Seaver were pitching today, he would have to adjust to the smaller strike zone and would be a different pitcher."
http://www.baseballlibrary.com/baseb...d_Harold11.stm